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  <title>Release Notes for STM32_AI_AudioPreprocessing_Library Package</title>
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<h1 id="release-notes-for-stm32_ai_audiopreprocessing_library"><small>Release Notes for</small> <strong>STM32_AI_AudioPreprocessing_Library</strong></h1>
<p>Copyright © 2019 STMicroelectronics<br />
</p>
<a href="https://www.st.com" class="logo"><img src="_htmresc/st_logo.png" alt="ST logo" /></a>
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<h1 id="license">License</h1>
<p>Licensed under Software License Agreement SLA0055 (the “License”). You may not use this package except in compliance with the License. You may obtain a copy of the License at:</p>
<p><a href="https://www.st.com/resource/en/license_agreement/dm00251784.pdf">SLA0055: SOFTWARE LICENSE AGREEMENT</a></p>
<h1 id="purpose">Purpose</h1>
<p>This STM32_AI_AudioPreprocessing_Library is a C Library for audio preprocessing in Artificial Intelligence applications optimized for STM32 devices. It provides the building blocks for spectral analysis and feature extraction, such as:</p>
<ul>
<li>Spectrogram computation</li>
<li>Mel-scaled and LogMel-scaled spectrogram computation</li>
<li>Mel-frequency cepstral coefficients (MFCCs) computation</li>
</ul>
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<h1>Update History</h1>
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<input type="checkbox" id="collapse-section6" checked aria-hidden="true"> <label for="collapse-section6" aria-hidden="true"><strong>1.1.2 / April-2021</strong></label>
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<p>Patch release</p>
<h2 id="main-changes">Main Changes</h2>
<ul>
<li>Adds usage examples for melspectrogram and MFCC computation</li>
</ul>
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<input type="checkbox" id="collapse-section5" aria-hidden="true"> <label for="collapse-section5" aria-hidden="true"><strong>1.1.1 / March-2021</strong></label>
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<p>Patch release</p>
<h2 id="main-changes-1">Main Changes</h2>
<ul>
<li>Fixes DCT Type-II Ortho for MFCC calculation with librosa</li>
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<input type="checkbox" id="collapse-section4" aria-hidden="true"> <label for="collapse-section4" aria-hidden="true"><strong>1.1.0 / June-2019</strong></label>
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<p>Maintenance release</p>
<h2 id="main-changes-2">Main Changes</h2>
<p>Bug fixes and cleanup</p>
<ul>
<li>Adds magnitude spectrograms support</li>
<li>Adds log scale mel_filterbank supoport</li>
<li>Updates DCT module</li>
<li>Updates documentation</li>
</ul>
<h2 id="backward-compatibility">Backward Compatibility</h2>
<p>This release breaks compatibility with previous versions.</p>
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<input type="checkbox" id="collapse-section3" aria-hidden="true"> <label for="collapse-section3" aria-hidden="true"><strong>1.0.0 / 05-April-2019</strong></label>
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<p>First release</p>
<h2 id="dependencies">Dependencies</h2>
<p>This software release is compatible with:</p>
<ul>
<li>CMSIS Version 4.5.0</li>
<li>CMSIS-DSP Version 1.4.7</li>
</ul>
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